Tank mitigation should be balanced to dungeons

[Oizen]

DRK is the king of mitigation.

* Magic Mitigation

If you account for Physical damage, Dark Knight has no unique mitigation until lv 70, and in current content it only has 10% unique mitigation for it with Oblation. Not an issue in raids as they tend to either be mixed or dominantly magic, but in anything physical DRK only has TBN/Oblation on the other tanks. Not even its raidwide mit can be used here.